Epothilone side components

ABSTRACT

The invention concerns compounds which can be obtained by fermenting DSM 6773, especially epothilones A1, A2, A8, A9, B10, C1, C2, C3, C4, C5, C6, C7, C8, C9, D1, D2, D5, G1, G2, H1, H2, I1, I2, I3, I4, I5, I6 and K and trans-epothilones C1 and C2.

This application is a continuation application of U.S. patent application Ser. No. 10/457,098, filed Jun. 6, 2003 now abandoned, which is a divisional application of Ser. No. 09/719,932 now U.S. Pat. No. 6,624,310, filed Mar. 21, 2001, which is the U.S. National Stage of PCT/EP99/04244, filed Jun. 18, 1999, which claims priority to DE 19826988.9, filed Jun. 18, 1998, the disclosures of each are herein incorporated by reference in their entireties.

The invention concerns compounds which in the present context are designated epothilone side components, viz. compounds 5 to 13 and 16 to 39. These compounds can be produced by fermenting DSM 6773 in accordance to DE 41 38 042.8.

Characterizing data of the compounds according to the invention will be compiled as follows.

Production: The processing of a raw epothilone mixture, which has been produced by fermenting DSM 6773 in a 900 1 fermentor, can be drawn schematically from FIGS. 1 to 2.

Activities: cf. table 1.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a separation scheme for the raw epothilones into fractions and the fractions into compounds.

FIG. 2 is a schematic diagram showing the separation of the fractions into separate compounds and the amounts of said compounds.

Epothilone A₁ (5): colorless amorphous solid; [α]²² _(D) −69 (c 0.1, MeOH); UV (MeOH) λ_(max) nm (ε) 208 (19600), 247 (13600); IR (KBr) ν_(max) 3437, 2959, 2931, 2876, 1732, 1710, 1455, 1259, 978 cm⁻¹; ¹H NMR (CDCl₃, 400 MHz) δ 6.95 (1H, s, H-19), 6.60 (1H, bs, H-17), 5.68 (1H, dd, J=4.4, 4.0 Hz, H-15), 4.12 (1H, m, H-33), 3.71 (1H, m, H-7), 3.52 (1H, bs, 7-OH), 3.37 (1H, bd, J=7.5 Hz, 3-OH), 3.21 (1H, dq, J=7.7, 7.0 Hz, H-4), 3.02 (1H, ddd, J=9.2, 4.5, 2.8 Hz, H-13), 2.87 (1H, ddd, J=8.3, 4.5, 3.7 Hz, H-12), 2.78 (1H, dd, J=16.8, 4.3 Hz, H-2a), 2.70 (3 H, s, H-21), 2.66 (1H, dq, J=3.9, 7.0 Hz, H-6), 2.65 (1H, dd, J=16.8, 5.2 Hz, H-2b), 2.16 (1H, ddd, J=15.4, 4.4, 2.8 Hz, H-14 a), 2.12 (3H, bs, H-27), 1.91 (1H, ddd, J=15.4, 9.2, 4.0 Hz, H-14b), 1.63 (1H, m, H-10a), 1.62 (2H, m, H-11), 1.59 (1H, m, H-9a), 1.52 (1H, m, H-10b), 1.39 (1H, m, H-8), 1.35 (1H, m, H-9b), 1.211 (3H, d; J=7.0 Hz, H-2-3), 1.207 (3H, d, J=7.0 Hz, H-24), 0.89 (3H, d, J=6.9 Hz, H-25); EIMS m/z 479 [M]⁺ (21), 3322 (31), 306 (65), 304 (47), 168 (45), 166 (73), 164 (100), 151 (30), 140 (35); HREIMS m/z 479.2317 (calcd. for C₂₇H₄₁NO₅S, 479.2342).

Epothilone A₂ (6): colorless amorphous solid; [α]²² _(D) +12.0 (c 1.0, MeOH); UV (MeOH) λ_(max) nm (ε) 210 (15100), 248 (15500); IR (KBr) ν_(max) 3438, 2963, 2929, 2875, 1734, 1706, 1458, 1262, 981 cm⁻¹; ¹H NMR (CDCl₃, 400 MHz) δ 6.98 (1H, s, H-19), 6.63 (1H, bs, H-17), 5.40 (1H, dd, J=8.3, 3.4 Hz, H-15), 4.26 (1H, ddd, J=8.5, 4.8, 4.7 Hz, H-3), 3.85 (1H, dd, J=7.9, 2.6 Hz, H-7), 3.54 (1H, bs, 3-OH), 3.09 (1H, dq, J=4.8, 7.0 Hz, H-4), 3.01 (1H, ddd, J-8.3, 4.8, 4.6 Hz, H-13), 2.98 (1H, dq, J=7.9, 7.0 Hz, H-6), 2.89 (1H, ddd, J=6.7, 4.6, 4.4 Hz, H12), 2.68 (3H, s, H-21), 2.60 (1H, dd, J=15.1, 8.5 Hz, H-2a), 2.52 (1H, bs, 7-OH), 2.50 (1H, dd, J=15.1, 4.7 Hz, H-2b), 2.18 (1H, ddd, J=15.0, 4.8, 3.4 Hz, H-14a), 2.11 (3H, d, J=1.3 Hz, H-27), 1.82 (1H, ddd, J=15.0, 8.3, 8.1 Hz, H-14b), 1.63 (1H, m, H-8), 1.61 (2H, m, H-11a and H-10a), 1.46 (1H, m, H-11b), 1.39 (2H, m, H-9), 1.31 (1H, m, H-10b), 1.22 (3H, d, J=7.0 Hz, H-24), 1.15 (3H, d, J=7.0 Hz, H-22), 1.01 (3H, d, J=6.9 Hz, H-25); ¹³C NMR (CDCl₃, 100 MHz) δ 216.2 (s, C-5), 170.1 (s, C-1), 164.9 (s, C-20), 152.0 (s, C-18), 137.0 (s, C-16), 120.3 (d, C-17), 116.5 (d, C-19), 76.7 (d, C-15), 75.6 (d, C-7), 69.1 (d, C-3), 57.1 (d, C-12), 54.3 (d, C-13), 50.3 (d, C-4), 49.6 (d, C-6), 39.4 (t, C-2), 35.5 (d, C-8), 32.2 (t, C-14), 29.6 (t, C-9), 27.6 (t, C-11), 23.9 (t, C-10), 19.2 (q, C-21), 18.0 (q, C-25), 15.6 (q, C-27), 13.9 (q, C-24), 12.4 (q, C-22); EIMS m/z 479 [M]⁺ (18), 322 (38), 306 (78), 304 (59), 168 (48), 166 (96), 164 (100), 151 (33), 140 (38); HREIMS m/z 479.2318 (calcd. for C₂₇H₄₁NO₅S, 479.2342).

Epothilone A₈ (7): colorless amorphous solid; [α]²²D −76.2 (c 1.0, MeOH); UV (MeOH) λ_(max) nm (ε) 210 (15300), 248 (15500); IR (KBr) ν_(max) 3440, 2967, 2932, 2876, 1736, 1691, 1467, 1252, 979 cm⁻¹; ¹H NMR (CDCl₃, 400 MHz) δ 6.95 (1H, s, H-19), 6.64 (1H, dd, J=15.6, 0.9 Hz, H-17), 6.52 (1H, dd, J=15.6, 6.6 Hz, H-16), 5.68 (1H, dddd, J=7.8, 6.6, 3.2, 0.9 Hz, H15), 4.11 (1H, ddd, J=10.1, 6.6, 3.5 Hz, H-3), 3.78 (1H, ddd, J=5.2, 3.2, 3.2 Hz, H-7), 3.66 (1H, d, 1=6.6 Hz, 3-01-1), 3.23 (1H, dq, 1=5.2, 6.9 Hz, 1-1-6), 3.08 (1H, ddd, J=7.3, 5.5, 4.1 Hz, H-13), 2.90 (1H, ddd, 1=6.6, 4.6, 4.1 Hz, H-12), 2.69 (3H, s, H-21), 2.52 (1H, dd, J=14.7, 10.1 Hz, H-2a), 2.44 (1H, bd, J=3.2 Hz, 7-OH), 2.41 (1H, dd, J=14.7, 3.5 Hz, H-2b), 2.10 (1H, ddd, J=15.0, 5.5, 3.2 Hz, H-14a), 1.90 (1H, ddd, J=15.0, 7.8, 7.3 Hz, H-14b), 1.711 (1H, m, H-8), 1.65 (1H, m, H-11a), 1.50 (1H, m, H-10a), 1.47 (1H, m, H-11b), 1.40(2K m, H-9), 1.39 (1H, m, H-10b), 1.33 (3H, s, H-2-3)), 1.16 (3H, d, J=6.9 Hz, H-24), 1.08 (3H, s, H-22), 0.98 (3H, d, J=7.0 Hz, H-25); ¹³C NMR (CDCl₃, 75 MHz) δ 220.3 (s, C-5), 170.7 (s, C-1), 166.5 (s, C-20), 152.2 (s, C-18), 128.4 (d, C-16), 125.9 (d, C-17), 116.4 (d, C-19), 75.0 (d, C-7), 73.6 (d, C-3), 72.7 (d, C-15), 57.3 (d, C-12), 54.1 (d, C-13), 52.6 (s, C-4), 43.8 (d, C-6), 38.9 (t, C-2), 36.3 (d, C-8), 32.5 (t, C-14), 30.3 (t, C-9), 26.7 (t, C-11), 24.0 (t, C-10), 21.3 (q, C-23), 21.0 (q, C-22), 19.3 (q, C-21), 17.1 (q, C-25), 14.5 (q, C-24); EIMS m/z 479 [M]⁺ XXX; HRDCIMS m/z 480.2401 (calcd. for C₂₅H₃₈NO₆S, 480.2401).

Epothilone A₉ (8): colorless amorphous solid; [α]²² _(D) −37.6 (c 0.5, MeOH); UV (MeOH) λ_(max) nm (ε) 211 (15500), 253 (14100); IR (KBr) ν_(max) 3423, 2965, 2932, 2877, 1736, 1690, 1463, 1249, 1014, 979 cm⁻¹; ¹H NMR (CDCl₃, 400 MHz) δ 7.10 (1H, s, H-19), 6.72 (1H, dd, J=10.7, 4.3 Hz, 27-OH), 6.60 (1H, bs, H-17), 5.69 (1H, dd, J=11.6, 2.0 Hz, H-15), 5.59 (1H, d, J=6.6 Hz, 3-OH), 4.49 (1H, ddd, J=12.9, 4.3, 1.2 Hz, H-27a), 4.27 (1H, ddd, J=11.6, 6.6, 2.9 Hz, H-3), 4.11 (1H, ddd, J=12.9, 10.7, 1.0 Hz, H-27b), 3.71 (1H, ddd, J=4.8, 3.0, 2.8 Hz, H-7), 3.17 (1H, dq, J=3.0, 6.8 Hz, H-6), 3.04 (1H, ddd, J=9.7, 3.6, 2.2 Hz, H-13), 2.93 (1H, bs, 7OH), 2.91 (1H, ddd, J=9.7, 3.6, 2.7 Hz, H-12), 2.72 (3H, s, H-21), 2.48 (1H, dd, J=14.2, 11.6 Hz, H-2a), 2.11 (111, dd, J=14.2, 2.9 Hz, H-2b), 2.03 (1H, ddd, J=14.7, 2.2, 2.0 Hz, H-14a), 1.86 (1H, m, H-11 a), 1.85 (1H, m, -H-14b), 1.79 (1H, m, H-8), 1.52 (1H, m, H-10a), 1.37 (3H, m, H-9 and H-10b), 1.37 (3H, s, H-23), 1.36 (1H, m, H-11b), 1.19 (3H, d, J=6.8 Hz, H-24), 1.02 (3H, d, 1=7.1 Hz, H-25), 1.00 (3H, s, H-22); ¹³C NMR (CDCl₃, 75 MHz) δ 220.5 (s, C-5), 170.2 (s, C-1), 167.5 (s, C-20), 150.7 (s, C-18), 138.9 (s, C-16), 125.2 (d, C-17), 119.5 ((d, C19), 76.7 (d, C-15), 73.4 (d, C-7), 70.4 (d, C-3), 57.7 (d, C-12), 57.2 (t, C-27), 55.3 (d, C-13), 54.2 (s, C-4), 4i:3 (d, C-6),40.7 (t, C-2), 37.5 (d, C-8), 31.8 (t, C-14), 31.2 (t, C-9), 28.0 (t, C11), 23.7 (q, C-23), 23.2 (t, C-10), 19.2 (q, C-21), 16.58 (q, C-22), 15.8 (q, C-25), 13.5 (q, C-24); EIMS m/z 509 [M]⁺ (9), 491 (4), 322 (28), 321 (25), 180 (45), 167 (40), 166 (100), 165 (49), 154 (47), 138 (33); HREIMS m/z 509.2467 (calcd. for C₂₆H₃₉NO₇S, 509.2447).

Epothilone B₁₀ (9): colorless amorphous solid; [α]²² _(D) −27 (c 0.15, MeOH); UV (MeOH) λ_(max) nm (ε) 212 (15800), 247 (12500); IR (KBr) ν_(max) 3434, 2962, 2930, 2876, 2858, 1733, 1692, 1461, 1259, 1052, 981 cm⁻¹; ¹H NMR (CDCl₃, 600 MHz) δ 6.99 (1H, s, H-19), 6.60 (1H, bs, H-17), 5.42 (1H, dd, J=8.0, 3.0 Hz, H-15), 4.25 (1H, ddd, J=9.5, 6.3, 2.8 Hz, H-3), 4.23 (1H, bs, 3-OH), 3.77 (1H, ddd, J=4.0, 3.9, 3.8 Hz, H-7), 3.30 (1H, dq, J=4.0, 6.9 Hz, H6), 3.01 (2H, q, J=7.6 Hz, H-21), 2.81 (1H, dd, J=7.7, 4.6 Hz, H-13), 2.68 (1H, bs, 7-OH), 2.54 (1H, dd, J=13.9, 9.5 Hz, H-2a), 2.36 (1H, dd, J=13.9, 2.8 Hz, H-2b), 2.11 (1H, ddd, J=15.3, 4.6, 3.0 Hz, H-14a), 2.09 (3H, s, H-27), 1.91 (1H, ddd, J=15.3, 8.0, 7.7 Hz, H-14b), 1.74 (1H, m, H-8), 1.73 (1H, m, H-11a), 1.51 (1H, m, H-10a), 1.41 (1H, m, H-11b), 1.39 (3H, t, J=7.6 Hz, H-28), 1.38 (3H, m, H-9 and H-10b), 1.37 (3H, s, H-23), 1.28 (3H, s, H-26),1.17 (3H, d, J=6.9 Hz, H-24), 1.09 (3H, s, H-22), 1.01 (3H, d, J=7.0 Hz, H-25); EIMS m/z 521 [M]⁺ (22), 449 (7), 350 (18), 334 (57), 248 (16), 234 (27), 196 (41), 182 (59), 180 (96), 178 (100), 166 (44), 154 (44); HREIMS m/z 521.2808 (calcd. for C₂₈H₄₃NO₆S, 521.2811).

Epothilone G₁ (10): colorless amorphous solid; [α]²² _(D) −39.7 (c 1.0, MeOH); UV (MeOH) λ_(max) nm (ε) 203 (15200), 236 (15100); IR (KBr) ν_(max)3456, 2962, 2933, 2876, 1736, 1691, 1585, 1466, 1262, 980 cm⁻¹; ¹H NMR (CDCl₃, 400 MHz) δ 7.47 (1H, s, H-19), 6.33 (1H, bs, H-17), 5.42 (1H, dd, J=8.3, 2.9 Hz, H-15), 4.11 (1H, ddd, J=10.1, 6.1, 3.4 Hz, H-3), 3.78 (1H, bddd, J=5.2, 3.5, 3.5 Hz, H-7), 3.63) (1H, bd, J=6.1 Hz, 3-OH), 3.21 (1H, dq, J=5.2, 7.0 Hz, H-6), 3.00 (1H, ddd, J=7.7, 4.8, 4.2 Hz, H-13), 2.88 (1H, ddd, J=7.1, 4.2, 4.2 Hz, H12), 2.53 (1H, dd, J=14.8, 10.1 Hz, H-2a), 2.51 (1H, bd, J=3.5 Hz, 7-OH), 2.43 (1H, dd, J=14.8, 3.4 Hz, H-2b), 2.43 (3H, s, H-21), 2.07 (1H, ddd, J=15.1, 4.8, 2.9 Hz, H-14a), 1.99 (3H, d, J=1.3 Hz, H-27), 1.86 (1H, ddd, J=15.1, 8.3, 7.7 Hz, H-14b), 1.71 (1H, m, H-8), 1.69 (1H, m, H-11a), 1.53 (1H, m, H-10a), 1.42 (1H, m, H-11b), 1.40 (3H, m, H-9 and H-10b), 1.34 (3H, s, H-23), 1.16 (3H, d, J=7.0 Hz, H-24), 1.09 (3H, s, H-22), 0.99 (3H, d, J=6.9 Hz, H25); ¹³C NMR, (CDCl₃, 100 MHz) δ 220.1 (s, C-5), 170.5 (s, C-1), 161.0 (s, C-20), 1374 (s, C18), 136.7 (s, C-16), 135.9 (d, C-19), 116.4 (d, C-17), 76.4 (d, C-15), 74.9 (d, C-7), 73.7 (d, C3), 57.4 (d, C-12), 54.4 (d, C-13), 52.6 (s, C-4), 43.8 (d, C-6), 38.8 (t, C-2),″) 6.2 (d, C-8), 31.4 (t, C-14), 30.4 (t, C-9), 27.0 (t, C-11), 23.9 (t, C-10), 21.3 (q, C-23), 21.2 (q, C-22), 17.2 (q, C25), 15.8 (q, C-27), 14.4 (q, C-24), 13.8 (q, C-21); EIMS m/z 477 [M]⁺ (4), 405 (7), 290 (40), 152 (39), 150 (100), 14S (23), 124 (23); HREIMS m/z 477.2684 (calcd. for C₂₆H₃₉NO₇, 477.2727).

Epothilone G₂ (11): colorless amorphous solid; [α]²² _(D) −22.6 (c 1.0, MeOH); W (MeOH) λ_(max) nm (ε) 202 (21500), 236 (14800); IR (KBr) ν_(max)3456, 2965, 2934, 2877, 1737, 1690, 1586, 1464, 1250, 980 cm⁻¹; ¹H NMR (CDCl₃, 400 MHz) δ 7.48 (1H, s, H-19), 6.33 (1H, bs, H-17), 5.43 (IF, dd, J=7.1, 3.6 Hz, H-15), 4.12 (1H, ddd, J=9.9, 6.4, 3.4 Hz, H-3), 3.77 (1H, ddd, J=4.7, 4.4, 4.1 Hz, H-7), 3.83 (1H, bd, J=6.4 Hz, 3-OH), 3.30 (1H, dq, J=4.7, 6.9 Hz, H-6), 2.78 (1H, dd, J=7.0, 5.4 Hz, H-13), 2.54 (1H, dd, J=14.3, 9.9 Hz, H-2a), 2.51 (1H, bd, J=4.1 Hz, 7-OH), 2.44 (3H, s, H-21),2.40 (1H, dd, J=14.3, 3.4 Hz, H-2b), 2.03 (1H, ddd, J=15.2, 5.4, 3.611z, H-14a), 2.00 (3H, d, J=1.3 Hz, H-27), 1.92 (1H, ddd, J=15.1, 7.1, 7.0 Hz, H-14b), 1.71 (1H, m, H-8), 1.68 (1H, m, H-11a), 1.51 (1H, m, H-10a), 1.42 (1H, M, H-11), 1.39 (3H, m, H-9 and H-10b), 1.35 (3H, s, H-23), 1.26 (3H, s, H-26), 1.16 (3H, d, J=6.9 Hz, H-24),1.07 (3H, s, H-22), 0.99 (3H, d, J=7.0 Hz, H-25); ¹³C NMR (CDCl₃, 100 MHz) δ 220.7 (s, C-5), 170.5 (s, C-1), 161.0 (s, C-20), 137.4 (s, C-18), 136.5 (s, C-16), 135.9 (d, C-19), 116.3 (d, C-17),76.6 (d, C-15), 74.6 (d, C-7),73.5 (d, C-3), 61.3 (s, C-12), 61.1 (d, C-13), 52.7 (s, C4),43.4 (d, C-6), 39.0 (t,-C-2), 36.5 (d, C-8), 32.0 (t, C-11), 31.8 (t, C-14), 30.8 (t, C-9), 22.8 (t, C-10), 22.9 (q, C-26), 21.0 (q, C-23), 20.8 (q, C-22), 17.2 (q, C-25), 15.9 (q, C-27), 14.1 (q, C-24), 13.8 (q, C-21); EIMS m/z 491 [M]⁺ (21), 419 (6), 320 (18), 304 (39), 166 (42), 152 (57), 150 (100), 149 (44), 148 (58), 124 (35), 109 (33); HREIMS m/z 491.2878 (calcd. for C₂₇H₄₁NO₇, 491.2883).

Epothilone H₁ (12): colorless amorphous solid; [α]²² _(D) −84.2 (c 0.2, MeOH); UV (MeOH) λ_(max) nm (ε) 203 (19600), 237 (12000); IR (KBr) ν_(max)3436, 2933, 2880, 2860, 1734, 1688, 1585, 1251, 1007 cm⁻¹; ¹H NMR (CDCl₃, 400 MHz) δ 7.47 (1H, s, H-19), 6.31 (1H, bs, H-17),5.43 (1H, ddd, J=10.6, 10.2, 4.5 Hz, H-12), 5.36 (1H, dddd, J=10.6, 9.6, 5.0, 1.3 Hz, H-13), 5.30 (1H, dd, J=9.9, 2.0 Hz, H-15), 4.16 (1H, ddd, J=11.2, 5.3, 2.8 Hz, H-3),3.73 (1H, ddd, .I=3.9, 2.5, 2.3 Hz, H-7), 3.12 (1H, dq, J=2.3, 6.9 Hz, H-6), 2.92 (1H, d, J=2.5 Hz, 7-OH), 2.91 (1H, d, J=5.3 Hz, 7-OH), 2.66 (1H, ddd, J=15.1, 9.9, 9.6 Hz, H-14a), 2.50 (1H, dd, J=15.4, 11.2 Hz, H-2a), 2.43 (3H, s, H-21), 2.37 (1H, dd, J=15.4, 2.8 Hz, H-2b), 2.23 (1H, m, H-14b), 2.18 (1H, m, H-11a), 2.01 (1H, m, H-11), 2.08 (3H, d, J=1.3 Hz, H-27), 1.74 (1H, m, H-8), 1.65 (1H, m, H-10a), 1.33 (1H, m, H-9a), 1.31 (3H, s, H-23),1.19 (1H, m, H-10b), 1.18 (1H, m, H-9b), 1.17 (3H, d, J=6.9 Hz, H-24),1.08 (3H, s, H-22),0.99 (3H, d, J=7.1 Hz, H-25); ¹³C NMR, see Table 1; EIMS m/z 461 [M]⁺ (6), 310 (5), 274 (10), 273 (7), 171 (63), 152 (100), 148 (18), 111 (15); HREIMS m/z 461.2743 (calcd. for C₂₆H₃₉NO₆, 461.2777).

Epothilone H₂ (13): colorless amorphous solid; [α]²² _(D) −44.4 (c 0.25, MeOH); UV (MeOH) λ_(max) nm (ε) 203 (14500), 236 (12200); IR (KBr) ν_(max) 3436, 2967, 2935, 2880, 1734, 1690, 1586, 1251, 1007 cm⁻¹; ¹H NMR (CDCl₃, 400 MHz) δ 7.46 (1H, s, H-19), 6.30 (1H, bs, H-17), 5.23 (1H, dd, J=9.8, 2.1 Hz, H-15), 5.12 (1H, dd, J=10.1, 5.3 Hz, H-13), 4.20 (1H, ddd, J=10.8, 5.7, 2.9 Hz, H-3), 3.71 (1H, ddd, J=3.8, 2.6, 2.6 Hz, H-7),3.14 (1H, dq, J=2.6, 6.9 Hz, H-6), 2.93 (d, J=5.7 Hz, 3-OH), 2.90 (1H, bd, J=2.6 Hz, 7-OH), 2.62 (1H, ddd, J=15.1, 9.8, 9.8 Hz, H-14a), 2.46 (1H, dd, J=15.1, 10.8 Hz, H-2a), 2.43 (3H, s, H-21), 2.32 (1H, dd, J=15.1, 2.9 Hz, H-2b), 2.29 (1H, m, H-11a), 2.19 (1H, bd, J=15.1 Hz, H-14b), 1.97 (3H, d, J=1.3 Hz, H-27), 1.87 (1H, m, H-11b), 1.73 (1H, m, H-8), 1.67 (1H, m, H-10a), 1.65 (3H, bs, H-26), 1.32 (3H, s, H-23), 1.26 (2H, m, H-9), 1.24 (1H, m, H-10b), 1.18 (3H, d, J=6.9 Hz, H-24), 1.07 (3H, s, H-22), 1.00 (3H, d, J=7.0 Hz, H-25); ¹³C NMR (CDCl₃, 100 MHz) δ 220.6 (s, C-5), 170.3 (s, C-1), 161.0 (s, C-20), 138.6 (s, C-12), 138.4 (s, C-16), 137.5 (s, C-18), 135.6 (d, C-19), 120.8 (d, C-13), 115.8 (d, C-17), 78.9 (d, C-15), 74.3 (d, C-7), 72.7 (d, C-3), 53.3 (s, C-4), 42.0 (d, C-6), 39.6 (t, C-2), 38.6 (d, C-8), 32.4 (t, C-14), 31.9 (t, C-9), 31.6 (t, C-11), 25.6 (t, C-10), 23.0 (q, C-26), 22.8 (q, C-23), 18.8 (q, C-22), 16.1 (q, C-27), 15.9 (q, C-25), 13.8 (q, C-21), 13.6 (q, C-24); EIMS m/z 475 [M]⁺ (11), 288 (9), 287 (5), 188(7), 171 (32), 152 (100), 111 (10); HREIMS m/z 475.2913 (calcd. for C₂₇H₄₁NO₆, 475.2934).

Epothilone C₁ (16): colorless amorphous solid; [α]²² _(D) −114.0 (c 10.0, MeOH); UV (MeOH) λ_(max) nm (ε) 211 (16500), 248 (12500); IR (KBr) ν_(max) 3440, 2933, 2877, 2858, 1730, 1708, 1457, 1244, 981 cm⁻¹; ¹H NMR (CDCl₃, 300 MHz) δ 6.96 (1H, s, H-19), 6.56 (1H, bs, H-17), 5.47 (1H, dd, J=9.2, 3.0 Hz, H-15), 5.43 (1H, m, H-12), 5.40 (1H, m, H-13), 4.40 (1H, ddd, J=6.2, 6.1, 6.1 Hz, H-3), 3.69 (1H, dd, J=5.7, 3.6 Hz, H-7), 3.01 (1H, dq, J=5.7, 6.9 Hz, H-6), 3.01 (1H, bs, 3-OH), 2.84 (1H, dq, J=5.2, 7.0 Hz, H-4), 2.68 (3H, s, H-21), 2.66 (1H, ddd, 1=16.4, 9.2, 7.3 Hz, H-14a), 2.64 (1H, dd, J=15.9, 7.1 Hz, H-2a), 2.54 (1H, dd, J=15.9, 6.1 Hz, H-2b), 2.38 (1H, bd, J=16.4 Hz, H-14b), 2.35 (1H, bs, 7-OH), 2.07 (3H, bs, H-27), 2.03 (2H, m, H-11), 1.62 (1H, m, H-10a), 1.53 (1H, m, H-8), 1.35 (1H, m, H-9a), 1.22 (1H, M, H-9b), 1.19 (3H, d, J=6.9 Hz, H-24),1.14 (3H, d, J=6.9 Hz, H-23), 1.10 (1H, m, H-10b), 0.95 (3H, d, J=6.9 Hz, H-25); ¹³C NMR, see Table 1; EIMS m/z 463 [M]⁺ (5), 324 (8), 290 (8), 204 (7), 168 (100), 164 (15), 139 (36); HREIMS m/z 463.2381 (calcd. for C₂₃H₃₇NO₅S, 463.2392).

Epothilone D₁ (17): colorless amorphous solid; [α]²² _(D) −118.6 (c 0.5, MeOH); UV (MeOH) λ_(max) nm (ε) 208 (18300), 249 (11900); IR (KBr) ν_(max) 3439, 2965, 2934, 2877, 1729, 1707, 1456, 1250, 980 cm⁻¹; ¹H NMR (CDCl₃, 300 MHz) δ 6.98 (1H, s, H-19), 6.56 (1H, bs, H-17),5.51 (1H, dd, J=9.5, 3.4 Hz, H-15), 5.16 (1H, dd, J=8.0, 4.2 Hz, H-13), 4.42 (1H, ddd, J=7.1, 6.3, 5.5 Hz, H-3), 3.70 (1H, dd, J=6.5, 2.9 Hz, H-7), 3.07 (1H, dq, J=6.5, 6.9 Hz, H-6),2.95 (1H, dq, J=4.7, 7.0 Hz, H-4), 2.71 (3H, s, H-21), 2.69 (1H, dd, J=16.0, 6.3 Hz, H-2a), 2.64 (1H, m, H-14a), 2.59 (1H, dd, J=16.0, 7.1 Hz, H-2b), 2.46 (1H, bs, 3-OH), 2.38 (1H, bd, J=16.0 Hz, H-14b), 2.19 (1H, ddd, J=13.3, 8.6, 5.7 Hz, H-11a), 2.10(3H, d, J=1.4 Hz, H-27), 2.02 (1H, bs, 7-OH), 1.91 (1H, ddd, J=13.3, 6.0, 6.0 Hz, H-11b), 1.68 (1H, m, H-10a), 1.66 (3H, bs, H-26), 1.53 (1H, m, H-8), 1.37 (1H, m, H-9a), 1.26 (1H, m, H-9b), 1.24 (3H, d, J=6.9 Hz, H-24),1.19 (1H, m, H-10b), 1.14 (3H, d, J=7.0, H-23), 0.99 (3H, d, J=6.9 Hz, H-25); ¹³C NMR (CDCl₃, 100 MHz) δ 217.0 (s, C-5), 169.7 (s, C-1), 165.0 (s, C-20), 152.2 (s, C18), 1–38.5 (s, C-12), 137.7 (s, C-16), 120.7 (d, C-13), 120.1 (d, C-17), 116.3 (d, C-19), 78.8 (d, C-15), 77.2 (d, C-7), 67.7 (d, C-3), 52.1 (d, C-4), 46.5 (d, C-6), 40.6 (t, C-2), 37.6 (d, C-8), 32.3 (t, C-14), 31.8 (t, C-11), 29.5(t, C-9), 25.5 (t, C-10), 23.1 (q, C-26), 19.2 (q, C-21), 15.5 (q, C27), 16.6 (q, C-25), 14.5 (q, C-24), 9.7 (q, C-23); EIMS m/z 477 [M]⁺ (13), 304 (19), 303 (31), 218 (40), 204 (41), 168 (100), 164 (45), 157 (25), 139 (18); HREIMS m/z 477.2544 (calcd. for C₂₆H₃₉NO₅S, 477.2549).

Epothilone C₂ (18): colorless amorphous solid; [α]²² _(D) −11.6 (c 10.0, MeOH); UV (MeOH) λ_(max) nm (ε) 212 (15500), 249 (12100); IR (KBr) ν_(max) 3428, 2962, 2929, 2877, 2859, 1734, 1705, 1460, 1251, 9S2 cm⁻¹; ¹H NM (CDCl₃, 300 MHz) δ 6.99 (1H, s, H-19), 6.66 (1H, bs, H-17),5.55 (1H, ddd, J=10.4, 9.2, 6.1 Hz, H-12), 5.38 (1H, ddd, J=10.4, 9.3, 6.2 147, H-13),5.22 (1H, dd, J=8.8, 2.8 Hz, H-15), 4.42 (1H, dddd, J=9.4, 5.6, 4.2, 4.1 Hz, H-3),3.93 (1H, d, J=5.6 Hz, 3-OH), 3.86 (1H, m, H-7), 3.15 (1H, bs, 7-OH), 3.12 (1H, dq, J=4.2, 7.0 Hz, H-4), 3.00 (1H, dq, J=6.9, 7.0 Hz, H-6), 2.70 (3H, s, H-21), 2.62 (1H, dddd, J=15.1, 9.3, 8.8, 0.8 Hz, H-14a), 2.58 (1H, dd, J=15.4, 9.4 Hz, H-2a), 2.38 (1H, dd, J=15.4, 4.1 Hz, H-2b), 2.31 (1H, ddd, 0.1=15.1, 6.2, 2.8 Hz, H-14b), 2.08 (3H, d, J=1.3 Hz, H-27), 2.15 (1H, m, H-11a), 2.04 (1H, m, H-11b), 1.71 (1H, m, H-8), 1.59 (1H, m, H-10a), 1.43 (1H, m, H-9a), 1.31 (114, m, H-9b), 1.26 (3H, d, J=7.0 Hz, H-24), 1.15 (3H, d, J=7.0 Hz, H-23), 1.11 (1H, m, H-10b), 1.00 (3H, d, J=6.9 Hz, H-25); ¹³C NMR, see Table 1; EIMS m/z 463 [M]⁺ (7), 324 (7), 306 (8), 290 (17), 168 (100), 164 (14), 139 (27); HREIMS m/z 463.2392 (calcd. for C₂₅H₃₇NO₅S, 463.2392).

Epothilone D₂ (19): colorless amorphous solid; [α]²² _(D) −12.5 (c 1.0, MeOH); UV (MeOH) λ_(max) nm (ε) 210 (15400), 248 (11200); IR (KBr) ν_(max) 3436, 2965, 2930, 2877, 1732, 1705, 1458, 1253, 980 cm⁻¹; ¹H NMR (CDCl₃, 400 MHz) δ 6.97 (1H, s, H-19), 6.56 (1H, bs, H-17), 5.18 (IF, dd, J=7.9, 4.9 Hz, H-15), 5.18 (1H, ddd, J=9.6, 5.4, 1.0 Hz, H-13),4.27 (1H, m, H-3), 3.88 (1H, dd, J=5.6, 4.6 Hz, H-7), 3.19 (1H, bs, 3-OH), 3.07 (1H, dq, J=4.3, 7.0 Hz, H-4), 2.95 (1H, dq, J=5.6, 7.0 Hz, H-6), 2.70 (3H, s, H-21), 2.62 (1H, dd, J=14.9, 7.8 Hz, H-2a), 2.56 (1H, ddd, J=14.7, 9.6, 7.9 Hz, H-14a), 2.43 (1H, dd, J=14.9, 5.6 Hz, H-2b), 2.38 (1H, bs, 7-OH), 2.26 (1H, ddd, J=14.5, 5.4, 4.9 Hz, H-14b), 2.19 (1H, ddd, J=13.0, 10.4, 5.4 Hz, H-11a), 2.10 (3H, d, 0.1=1.4 Hz, H-27), 1.95 (1H, ddd, J=13.0, 10.3, 5.3 Hz, H-I1b), 1.72 (1H, m, H-S), 1.68 (3H, bs, H-26),1.61 (1H, m, H-10a), 1.39 (2H, m, H-9),1.21 (1H, m, H-10b), 1.19 (3H, d, J=6.9 Hz, H-24),1.17 (3H, d, J=7.0, H-22),1.00 (3H, d, J=6.9 Hz, H-25J; ¹³C NMR (CDCl₃, 100 MHz) δ 216.8 (s, C-5), 170.4 (s, C-1), 164.9 (s, C-20), 152.3 (s, C-18), 139.8 (s, C-12), 137.5 (s, C-16), 120.5 (d, C-17), 119.2 (d, C-13), 116.3 (d, C-19), 80.0 (d, C-15), 74.3 (d, C-7), 69.7 (d, C-3), 48.6 (d, C-4), 48.4 (d, C-6), 39.9 (t, C-2), 36.6 (d, C-8), 32.2 (t, C-14), 32.7 (t, C-11), 30.9 (t, C-9), 26.0 (t, C-10), 23.6 (q, C-26), 19.2 (q, C-21), 15.4 (q, C-27), 17.1 (q, C-25), 12.4 (q, C-24), 12.7 (q, C-23); EIMS m/z 477 [M]+(22), 304 (19), 303 (17), 218 (22), 204 (25), 163 (100), 164 (28), 157 (31), 139 (21); HREIMS m/z 477.2545 (calcd. for C₂₆H₃₉NO₅S, 477.2549).

Epothilone C₃ (20): colorless amorphous solid; [α]²² _(D) −62.1 (c 5.0, MeOH); UV (MeOH) λ_(max) nm (ε) 212 (16200), 248 (12300); IR (KBr) ν_(max) 3432, 2928, 2878, 2858, 1736, 1698, 1252, 1040 cm⁻¹; ¹H NMR (CDCl₃, 300 MHz) δ 6.95 (1H, s, H-19), 6.56 (1H, bs, H-17), 5.44 (1H, ddd, J=10.9, 10.3, 5.4 Hz, H-12), 5.33 (1H, ddd, J=10.9, 9.3, 4.6 Hz, H-13), 5.23 (1H, dd, J=9.5, 2.2 Hz, H-15), 4.36 (1H, ddd, J=11.3, 5.6, 2.3 Hz, H-3), 4.04 (1H, d, J=5.6 Hz, 3-OH), 3.93 (1H, ddd, 0.1=9.5, 2.3, 1.4 Hz, H-7), 3.56 (1H, bd, J=2.3 Hz, 7-OH), 2.70 (1H, dd, J=18.0, 1.4 Hz, H-6a), 2.67 (3H, s, H-21), 2.61 (1H, ddd, J=15.3, 9.5, 9.3 Hz, H-14a), 2.38 (1H, dd, 0.1=14.3, 11.3 Hz, H-2a), 2.36 (1H, dd, J=18.0, 9.5 Hz, H-6b), 2.28 (1H, bd, J=15.3 Hz, H-14b), 2.12 (1H, m, H-11a), 2.06 (1H, dd, J=14.3, 2.3 Hz, H-2b), 2.03 (3H, d, J=1.3 Hz, H-27),1.96 (1H, m, H-11b), 1.75 (1H, m, H-8), 1.54 (1H, m, H-10a), 1.26 (1H, m, H-9a), 1.25 (3H, s, H-23),1.17 (1H, m, H-10b), 1.15 (1H, m, H-9b), 1.03 (3H, s, H-22),0.91 (3H, d, J=6.8 Hz, H-25); ¹³C NMR, see Table 1; EIMS m/z 463 [M]⁺ (28), 290 (14), 168 (100), 164 (36), 157 (44), 151 (25), HREIMS m/z 463.2379 (calcd. for C₂₅H₃₇NO₅S, 463.2392).

Epothilone C₄ (21): colorless amorphous solid; [α]²² _(D) −75.6 (c 1.0, MeOH); UV (MeOH)) λ_(max) nm (ε) 212 (17200), 248 (12500); IR (KBr) ν_(max) 3434, 2974, 2932, 2859, 1735, 1686, 1252, 1046 cm⁻¹; ¹H NMR (CDCl₃, 300 MHz) δ 6.96 (1H, s, H-19), 6.60 (1H, bs, H-17), 5.43 (1H, m, H-12), 5.40 (1H, m, H-13), 5.26 (1H, dd, J=9.6, 2.3 Hz, H-15), 4.41 (1H, ddd, J=11.4, 5.8, 2.5 Hz, H-3 ), 3.78 (1H, m, H-7), 3.70 (1H, bs, 3-OH), 3.46 (1H, d, J=0.9 Hz, 7-OH), 3.01 (1H, dq, J=0.5, 7.0 Hz, H-6), 2.69 (3H, s, H-21), 2.66 (1H, ddd, J=15.3, 9.6, 8.8 Hz, H-14a), 2.47 (1H, dd, J=14.5, 11.4 Hz, H-2a), 2.29 (1H, m, H-1.4b), 2.25 (1H, dd, J=14.5, 2.5 Hz, H-2b), 2.24 (1H, m, H-11a), 2.07 (3H, d, J=1.4 Hz, H-27), 1.96 (1H, m, H-11b), 1.51 (2H, m, H-8), 1.44 (2H, m, H-10), 1.37 (2H, m, H-9), 1.32 (3H, s, H-23), 1.17 (3H, d, J=7.0 Hz, H-24), 1.07 (3H, s, H-22); ¹³C NMR, see Table 1; EIMS m/z 463 [M]⁺ (7), 276 (15), 171 (33), 168 (100), 164 (23), 151 (22), 111 (13); HREIMS m/z 463.2373 (calcd. for C₂₅H₃₇NO₅S, 463.2392).

Epothilone C₅ (22): colorless amorphous solid; [α]²² _(D) −158.2 (c 0.5, MeOH); UV (MeOH) λ_(max) nm (ε) 205 (19500), 247 (12700); IR (KBr) ν_(max) 3447, 2972, 2927, 1737, 1690, 1450, 1252, 1181, 936 cm⁻¹; ¹H NMR (CDCl₃, 400 MHz) δ 6.93 (1H, s, H-19), 6.48 (1H, bs, H-17), 5.48 (1H, ddd, J=10.7, 6.2, 6.2 Hz, H-12), 5.39 (1H, m, H-13), 5.37 (1H, M, H-9), 5.34 (1H, dd, J=8.0, 2.3 Hz, H-15), 4.29 (1H, dd, J=6.0, 2.6 Hz, H-7), 4.09 (1H, ddd, J=10.8, 7.1, 2.9 Hz, H-3), 3.59 (1H, d, J=7.1 Hz, 3-OH), 3.17 (1H, dq, J=6.0, 6.9 Hz, H-6), 2.68 (3H, s, H-21), 2.54 (1H, ddd, J=15.2, 8.1, 8.0 Hz, H-14a), 2.44 (1H, bs, 7-OH), 2.42 (1H, dd, J=15.1, 2.9 Hz, H-2a), 2.41 (1H, ddd, J=15.2, 2.3, 2.3 Hz, H-14b), 2.34 (1H, dd, J=15.1, 10.8 Hz, H2b), 2.20 (1H, m, H-10a), 2.18 (2H, m, H-11), 2.12 (1H, m, H-10b), 2.06 (3H, bs, H-27), 1.67 13 (3H, bs, H-25), 1.27 (3H, s, H-23), 1.21 (3H, d, J=6.9 Hz, H-24), 1.15 (311, s, H-22); ¹³C NMR, see Table 1; EIMS m/z 475 [M]⁺ (6), 392 (7), 304 (6), 288 (33), 204 (76), 171 (19), 168 (100), 164 (12); REIMS m/z 475.2380 (calcd. for C₂₆H₃₇NO₅S, 475.2392).

Epothilone D₅ (23): colorless amorphous solid; [α]²² _(D) −150 (c 0.2, MeOH); UV (MeOH) λ_(max) nm (ε) 205 (23300), 248 (13600); IR (KBr) ν_(max) 3439, 2967, 2927, 1736, 1690, 1451, 1254, 1181, 987 cm⁻¹; ¹H NMR (CDCl₃, 400 MHz) 5; 6.94 (1H, s, H-19), 6.51 (1H, bs, H-17), 5.34 (1H, bs, H-9), 5.29 (1H, dd, J=8.0, 2.4 Hz, H-15), 5.16 (1H, dd, J=8.2, 6.2 Hz, H-13), 4.30 (1H, bd, J=4.9 Hz, H-7), 4.19 (1H, ddd, J=10.8, 7.6, 3.0 Hz, H-3), 3.68 (1H, d, J=7.6 Hz, 3-OH), 3.17 (1H, dq, J=4.9, 7.0 Hz, H-6), 2.69 (3H, s, H-21), 2.65 (1H, d, J=2.1 Hz, 7-OH), 2.56 (1H, ddd, J=16.2, 8.2, 8.0 Hz, H-14a), 2.40 (1H, dd, J=15.0, 3.0 Hz, H-2a), 2.39 (1H, bd, J=16.2 Hz, H-14b), 2.34 (1H, dd, J=15.0, 10.8 Hz, H-2b), 2.25 (2H, m, H-10a and H-11a), 2.20 (1H, m, H-10b), 2.17 (1H, m, H-11b), 2.05 (3H, d, J=1.0 Hz, H-27),1.69 (3H, bs, H-25), 1.68 (3H, bs, H-26),1.29 (3H, s, H-23), 1.23 (3H, d, J=7.0 Hz, H-24), 1.16 (3H, s, H-22); ¹³C NMR, see Table 1; EIMS m/z 489 [M]⁺ (4), 406 (4), 338 (7), 302 (13), 218 (35), 171 (10), 168 (100), 153 (20), 125 (10); HREIMS m/z 489.2536 (calcd. for C₂₇H₃₉NO₅S, 489.2549).

Epothilone C₆ (24): colorless amorphous solid; [α]²² _(D) −205.2 (c 1.0, MeOH); UV (MeOH) λ_(max) nm (ε) 218 (24600), 237 (28800); IR (KBr) ν_(max) 3435, 2967, 2927, 2882, 1732, 1688, 1465, 1258, 988 cm⁻¹; ¹H NMR (CDCl₃, 300 MHz) δ 6.97 (1H, s, H-19), 6.58 (1H, bs, H-17), 6.43 (1H, dd, 15.5, 10.8 Hz, H-11), 6.11 (1H, dd, J=10.8, 10.6 Hz, H-12), 5.75 (1H, ddd, J=15.5, 8.3, 5.6 Hz, H-10), 5.34 (1H, m, H-13), 5.34 (1H, dd, J=9.7, 2.4 Hz, H-15), 4.16 (1H, ddd, J=9.2, 4.9, 4.3 Hz, H-33), 3.74 (1H, ddd, J=2.2, 2.1, 1.7 Hz, H-7), 3.24 (1H, dq, J=2.1, 6.9 Hz, H-6), 3.06 (1H, d, J=2.2 Hz, 7-OH), 2.93 (1H, d, J=4.9 Hz, 3-OH), 2.78 (1H, dddd, J=14.1, 9.9, 9.7, 0.7, H-14a), 2.71 (3H, s, H-21), 2.48 (1H, m, H-9a), 2.47 (1H, dd, J=15.5, 9.2 Hz, H-2a), 2.40 (1H, dd, J=15.5, 4.3 Hz, H-2b), 2.38 (1H, bdd, J=14.1, 7.8 Hz, H-14b), 2.11 (3H, d, J=1.3 Hz, H-27), 1.96 (1H, m, H-8), 1.33 (3H, s, H-23), 1.11 (3H, d, J=6.9 Hz, H-24),1.06 (3H, s, H-22),1.05 (3H, d, J=6.8 Hz, H-25); ¹³C NMR, see Table 1; EIMS m/z 475 [M]⁺ (13), 387 (2), 316 (4), 288 (15), 230 (16), 204 (9), 171 (18), 168 (100), 164 (14), 151 (17); HREIMS m/z 475.2361 (calcd. for C₂₆H₃₇NO₅S, 475.2392).

Epothilone C₇ (25): colorless amorphous solid; [α]²² _(D) −XXX (c 2.0, MeOH); UV (MeOH) λ_(max) nm (ε) XXX (XXX), XXX (XXX); IR (KBr) ν_(max) XXX cm⁻¹; ¹H NMR (CDCl₃, 400 MHz) δ 7.01 (1H, s, H-19),6.66 (1H, bs, H-17),5.59 (1H, ddd, J=11.1, 11.1, 3.8 Hz, H-12), 5.40 (1H, dd, J=11.1, 9.2, H-13), 5.03 (1H, d, J=9.3 Hz, H-15), 4.62 (1H, dd, J=9.3, 9.2 Hz, H-14), 4.18 (1H, bd, J=11.0 Hz, H-3), 3.72 (1H, bs, H-7),3.20 (1H, bs, 3-OH), 3.09 (1H, dq, J=1.9, 6.8 Hz, H-6), 3.00 (1H, bs, 7-OH), 2.69 (3H, s, H-21),2.47 (1H, dd, J=14.8, 11.0 Hz, H-2a), 2.32 (1H, dd, J=14.8, 2.6 Hz, H-2b), 2.27 (1H, m, H-11a), 2.19 (3H, bs, H-27), 2.13 (1H, m, H-11b), 1.76 (1H, m, H-8), 1.70 (1H, m, H-10a), 1.35 (1H, m, H-9a), 1.32 (3H, s, H-23 ), 1.23 (1H, m, H-9b), 1.21 (1H, m, H-10b), 1.18 (3H, d, J=6.8 Hz, H-24), 1.08 (3H, s, H-22), 1.00 (3H, d, J=6.9 Hz, H-25); EIMS m/z 493 [M]⁺ XXX; HREIMS m/z 493.XXX (calcd. for C₂₆H₃₉NO₆S, 493.2498).

Epothilone C₈ (26): colorless amorphous solid; [α]²² _(D) −75.2 (c 2.5, MeOH); UV (MeOH) λ_(max) nm (ε) 210 (16803), 248 (17800); IR (KBr) ν_(max)3443, 2932, 2881, 1734, 1689, 1465, 1255, 1183, 976 cm⁻¹; ¹H NMR (CDCl₃, 300 MHz) δ 6.93 (1H, s, H-19), 6.62 (1H, dd, J=15.6, 0.6 Hz, H-17), 6.49 (H, dd, J=15.6, 6.6 Hz, H-16), 5.52 (1H, dddd, J=9.5, 6.6, 2.8, 0.6 Hz, H-15), 5.42 (1H, m, H-12), 5.41 (1H, m, H-13), 4.13 (1H, ddd, J=11.0, 5.3, 2.8 Hz, H-3), 3.69 (1H, ddd, J=3.7, 2.8, 2.5 Hz, H-7), 3.11 (1H, dq, J=2.5, 6.8 Hz, H-6), 2.95 (1H, d, J=5.3 Hz, 3-OH), 2.90 (1H, d, J=2.8 Hz, 7-OH), 2.69 (3H, s, H-21), 2.67 (1H, ddd, 0.1=14.9, 9.5, 8.4 Hz, H-14a), 2.48 (1H, dd, J=15.6, 11.0 Hz, H-2a), 2.33 (1H, dd, J=15.6, 2.8 Hz, H-2b), 2.30 (1H, bd, J=14.9 Hz, H-14b), 2.14 (1H, m, H-11a), 2.03 (1H, m, H-11b), 1.71 (1H, m, H-8),1.63 (1H, m, H-10a), 1.31 (1H, m, H-9a), 1.29 (3H, s, H-23),1.17 (3H, d, J=6.8 Hz, H-24),1.16 (1H, m, H-10b), 1.14 (1H, m, H-9b), 1.05 (3H, s, H-22), 0.97 (3H, d, J=7.1 Hz, H-25); ¹³C NMR, see Table 1; EIMS m/z 463 [M]⁺ (21), 310 (10), 276 (21), 171 (83), 154 (100), 150 (27), 111 (18); HREIMS m/z 463.2382 (calcd. for C₂₅H₃₇NO₅S, 463.2392).

Epothilone C₉, (27): colorless amorphous solid; [α]²² _(D) −93.4 (c 1.0, MeOH); UV (MeOH) λ_(max) nm (ε) 209 (15200), 254 (15700); IR (KBr)) ν_(max) 3416, 2966, 2932, 1736, 1689, 1463, 1249, 1011 cm⁻¹; ¹H NMR (CDCl₃, 400 MHz) δ 7.06 (1H, s, H-19), 6.65 (1H, bs, H-17), 6.56 (1H, dd, J=10.6, 4.4 Hz, 27-OH), 5.55 (1H, d, J=6.2 Hz, 3-OH),5.52 (1H, dd, J=11.6, 2.0 Hz, H-15), 5.44 (1H, dddd, J=11.2, 10.7, 3.1, 1.7 Hz, H-12), 5.35 (1H, dddd, J=11.0, 10.7, 3.9, 1.7 Hz, H-13),4.47 (11-1, ddd, J=12.5, 4.4, 1.3 Hz, H-27a), 4.35 (1H, ddd, J=11.7, 6.2, 2.6 Hz, H-3), 4.20 (1H, ddd, J=12.5, 10.6, 0.9 Hz, H-27b), 3.63 (1H, ddd, J=4.6, 1.8, 0.9 Hz, H-7), 3.24 (1H, d, J=1.8 Hz, 7-OH), 3.13 (1H, dq, J=0.9, 6.8 Hz, H-6), 2.80 (1H, ddd, J=14.8, 11.6, 11.0 Hz, H-14a), 2.71 (3H, s, H-21), 2.40 (1H, dd, J=14.4, 11.7 Hz, H-2a), 2.24 (1H, m, HI1a), 2.06 (1H, dd, J=14.4, 2.6 Hz, H-2b), 2.01 (1H, ddd; J=14.8, 3.9, 2.0 Hz, H-14b), 2.00 (1H, m, H-11b), 1.77 (1H, m, H-8),1.69 (1H, m, H-10a), 1.35 (1H, m, H-9a), 1.35 (3H, s, H23), 1.19 (1H, m, H-10b), 1.19 (3H, d, J=6.8 Hz, H-24), 1.18 (1H, m, H-9b), 1.01 (3H, d, J=7.1 Hz, H-25),0.98 (3H, H-22); ¹³C NMR, see Table 1; EIMS m/z 493 [M]⁺ (17), 306′(64), 184 (50), 171 (30), 167 (38), 166 (100), 138 (12); HREIMS m/z 493.2502 (calcd. for C₂₆H₃₉NO₆S, 493.2498).

trans-Epothilone C₁, (28): colorless amorphous solid; [α]²² _(D) −84 (c 0.2, MeOH); UV (MeOH) λ_(max) nm (ε) 211 (17400), 248 (12900); 1R (KBr) ν_(max) 3433, 2961, 2933, 2879, 1730, 1708, 1457, 1251, 975 cm⁻¹; ¹H NMR (CDCl₃, 600 MHz) δ 7.00 (1H, s, H-19),6.64 (1H, bs H17),5.45 (1H, ddd, J=15.2, 6.5, 6.5 Hz, H-12),5.42 (1H, dd, J=6.4, 3.7 Hz, H-15),5.35 (1H, dt, J=15.2, 7.1 Hz, H-13), 4.42 (1H, m, H-3),3.58 (1H, ddd, J=8.1, 7.9, 2.8 Hz, H-7),3.24 (1H, m, H-6), 3.14 (1H, dq, J=4.0, 6.9 Hz, H-6), 2.92 (1H, d, J=7.9 Hz, 7-OH), 2.71 (3H, s, H-21), 2.71 (2H, m, H-2), 2.53 (2H, m, H-14), 2.17 (1H, d, J=2.17 Hz, 3-OH), 2.11 (1H, m, H-11a), 2.06 (3H, bs, H-27), 1.93 (1H, m, H-11b), 1.68 (1H, m, H-9a), 1.65 (1H, m, H-10a), 1.33 (1H, m, H-8), 1.26 (3H, d, J=6.8 Hz, H-24), 1.16 (1H, m, H-10b), 1.12(3K d, J=6.9 Hz, H-22), 1.07 (1H, m, H-9b), 1.00 (3H, d, J=6.8 Hz, H-25); ¹³C NMR, see Table 1; EIMS m/z 463 [M]⁺ (6),290 (21), 289 (20), 204 (23), 194 (19), 190 (22), 168 (100), 164 (48), 157 (14), 152 (19), 151 (17), 139 (15), 111 (18); HREIMS m/z 463.2371 (calcd. for C₂₅H₃₇NO₅S, 463.2392).

trans-Epothilone C₂ (29): colorless amorphous solid; [α]²² _(D) −3 (c 1.5, MeOH); UV (MeOH) λ_(max) nm (ε) 211 (15800), 248 (11900); IR (KBr) ν_(max) 3435, 2963, 2931, 2878, 1731, 1706, 1457, 1273, 979 cm⁻¹; ¹H NMR (CDCl₃, 600 MHz) δ 6.99 (1H, s, H-19), 6.57 (1H, bs, H17), 5.56*(1H, ddd, J=15.1, 7.4, 7.0 Hz, H-12), 5.41 (1H, ddd, J=15.1, 7.0, 6.9 Hz, H-13), 5.41 (1H, dd, J=7.7, 2.8 Hz, H-15), 4.13 (1H, dddd, J=6.7, 6.2, 5.6, 5.1 Hz, H-3), 3.78 (1H, ddd, J=8.2, 6.5, 1.9 Hz, H-7), 3.18 (1H, d, J=5.6 Hz, 3-OH), 3.06 (1H, dq, J=8.2, 7.1 Hz, H-6),2.98 (1H, dq, J=6.2, 7.0 Hz, H-4), 2.71 (3H, s, H-21),2.64 (1H, dd, J=15.1, 6.7 Hz, H2a), 2.54 (1H, dd, J=15.1, 5.1 Hz, H-2b), 2.44 (2H, m, H-14),2.22 (1H, dddd, J=13.8, 7.0, 6.2, 2.9 Hz, H-11a), 2.10 (3H, d, J=1.1 Hz, H-27), 2.09 (˜H, d, J=6.5 Hz, 7-OH), 1.88 (1H, dddd, J=13.8, 10.9, 7.4, 2.9 Hz, H-11b), 1.65 (1H, m, H-8), 1.63 (1H, m, H-10a), 1.56 (1H, dddd, J=12.7, 12.7, 3.9, 3.9 Hz, H-9a), 1.20 (3H, d, J=7.1 Hz, H-24), 1.15 (3H, d, J=7.0 Hz, H-23),1.13 (1H, m, H-10b), 1.04 (1H, m, H-9.b), 1.01 (3H, d, J=7.0 Hz, H-25); ¹³C NMR, see Table 1; EIMS m/z 463 [M]⁺ (13), 290 (11), 190 (10), 168 (100), 164 (20), 157 (26), 139 (17); HREIMS m/z 463.2383 (calcd. for C₂₅H₃₇NO₅S, 463.2392).

Epothilone I₁, (30): colorless amorphous solid; [α]²² _(D) −XXX (c XXX, MeOH); UV (MeOH) λ_(max) nm (ε) XXX; IR (KBr) ν_(max) XXX cm⁻¹; ¹H NMR (CDCl₃, 300 MHz) 6.96 (1H, s, H-19),6.54 (1H, bs, H-17),5.49 (Iii, ddd, J=10.3, 7.3, 7.3 Hz, H-12), 5.33 (1H, dd, J=8.3, 4.4 Hz, H-15),5.31 (1H, m, H-133),4.15 (1H, ddd, J=8.0, 5.0, 4.6 Hz, H-3), 3.80 (1H, m, H-7), 3.21 (1H, dq, J=6.0, 6.9 Hz, H-6),2.89 (1H, d, J=5.0 Hz, 3-OH); 2.70 (3H, s, H-21),2.65 (1H, ddd, J=15.8, 8.5, 8.3 Hz, H-14a), 2.42 (2H, m, H-2),2.35 (1H, m, H-14b), 2.27 (1H, bd, 0.1=3.3 Hz, 7-OH), 2.13 (1H, m, H-11a), 2.09 (3H, d, J=1.2 Hz, H-27),2.00 (1H, m, H-11b), 1.72 (1H, m, H-8), 1.40 (2H, m, H-10_(β)), 1.37 (1H, m, H-9_(β)a), 1.36 (2H, m, H-9_(a)), 1.32 (3H, s, .H-23),1.27 (3H, m, H-9_(β)b and H-10_(a)), 1.13 (3H, d, J=6.9 Hz, H-24), 1.09 (3H, s, H-22),0.94 (3H, d, J=6.9 Hz, H-25); ¹³C NMR (CDCl₃, 75 MHz) δ 221.3 (s, C-5), 171.1 (s, C-1), 164.8 (s, C-20), 152.4 (s, C-18), 137.4 (s, C-16), 133.8 (d, C-12),124.6 (d, C-13), 120.0 (d, C-17), 116.2 (d, C-19), 78.8 (d, C-15), 74.9 (d, C-7), 74.7 (d, C-3), 51.6 (s, C4), 43.7 (d, C-6), 38.9 (t, C-2), 34.3 (d, C-8), 31.6 (t, C-14), 29.3 (t, C-9_(a), 28.6 (t, C-10_(β)), 28.2 (t, C-10_(a)), 26.6 (t, C-11), 24.8 (t, C-9_(β)), 23.6 (q, C-22), 19.3 (q, C23), 19.3 (q, C-21), 16.5 (q, C-25), 15.5 (q, C:27), 13.7 (q, C-24); EIMS m/z 505 [M]⁺ XXX; HREIMS m/z 505.XXX (calcd. for C₂₈H₄₃NO₅S, 505.XXX).

Epothilone I₂, (31): colorless amorphous solid; [α]²² _(D) −XXX (c XXX, MeOH); UV (MeOH) λ_(max) nm (ε) XXX; IR (KBr) ν_(max) XXX cm⁻¹; ¹H NMR (CDCl₃, 300 MHz) α 6.95 (1H, s, H-19), 6.53 (1H, bs, H-17), 5.40 (1H, m, H-12), 5.38 (1H, dd, J=9.8, 3.3 Hz, H-15), 5.37 (1H, m, H-133).4.21 (1H, ddd, 0.1=8.6, 3.8, 3.6 Hz, H-3),3.85 (1H, ddd, J=8.5, 5.8, 2.2 Hz, H7), 3.18 (1H, dq, J=8.5, 7.0 Hz, H-6),2.70 (3H, s, H-21),2.65 (1H, ddd, J=15.2, 9.8, 9.0 Hz, H-14a), 2.51 (1H, d, J=3.6 Hz, 3-OH), 2.37 (2H, m, H-2),2.32 (1H, bd, J=15.2 Hz, H-14b), 2.09 (3H, d, J=1.3 Hz, H-27),2.07 (2H, m, H-11), 1.78 (1H, m, H-8), 1.65 (1H, d, J=5.8 Hz, 7-OH), 1.57 (1H, m, H-10_(β)a), 1.44 (1H, m, H-10_(α)a), 1.42 (1H, m, H-9_(β), 1.32 (3H, s, H-23), 1.21 (1H, m, H-10_(β)b), 1.17 (3H, d, J=7.0 Hz, H-24),1.13 (2H, m, H-9_(α)),1.06 (3H, s, H-22), 0.95 (3H, d, J=7.0 Hz, H-25_(α)), 0.91 (3H, d, J=6.5 Hz, H-25_(β)), 0.68 (1H, m, H-10.b); ¹³C NMR (CDCl₃, 100 MHz) δ 220.4 (s, C-5),171.3) (s, C-1), XXX (s, C-20),152.4 (s, C-18),137.6 (s, C-16), 13)4.5 (d, C-12),125.3) (d, C-13), 119.6 (d, C-17),116.2 (d, C-19),78.6 (d, C-15),77.2 (d, C-7),75.0 (d, C-3), 51.0 (s, C-4),44.6 (d, C-6),38.2 (t, C-2),36.9 (t, C-9_(α)),34.5 (t, C-10_(α)) 32.6 (d, C-8), 32.0 (t, C-14), 30.0 (d, C-9_(β)), 27.4 (t, C-11), 26.6 (t, C-10p), 25.0 (q, C-22), 21.5 (q, C-25_(β)), 19.3 (q, C-21),17.9 (q, C-25_(α)),17.7 (q, C-23),15.8 (q, C-24),15.6 (q, C-27); EIMS m/z 519 MV XXX; HREIMS, n/. 519.XXX (calcd. for C₂₉H₄₅NO₅S, 519.XXX).

Epothilone I₃ (32): colorless amorphous solid; [α]²² _(D) −XXX (c XXX, MeOH); UV (MeOH) λ_(max) nm (ε) XXX; IR (KBr) ν_(max) XXX cm⁻¹; ¹H NMR (CDCl₃, 400 MHz) δ 6.95 (1H, s, H-19),6.52 (1H, bs, H-17),5.32 (1H, dd, J=9.1, 3.0 Hz, H-15), 5.08 (1H, dd, J=8.˜,3.9 Hz, H-13), 4.13 (1H, ddd, J=9.4, 4.3, 3.2 Hz, H-3),3.81 (1H, m, H-7), 3.18 (1H, dq, J=6.8, 7.0 Hz, H-6), 2.83 (1H, d, J=4.3 Hz, 3-OH), 2.70 (3H, s, H-21), 2.61 (1H, ddd, J=15.8, 9.1, 8.5 Hz, H-14 a), 2.43 (1H, dd, J=14.0, 3.2 Hz, H-2a), 2.38 (2H, dd, J=14.0, 9.4 Hz, H-2b), 2.30 (1H, bd, J=15.8 Hz, H-14b), 2.16 (1H, ddd, J=14.1, 8.3, 7.4 Hz, H-11a), 2.08 (3H, d, J=1.0 Hz, H-27), 1.99 (1H, d, J=4.7 Hz, 7-OH), 1.92 (1H, ddd, J=14.1, 6.3, 6.3 Hz, H-1 Ib), 1.82 (1H, m, H-8), 1.67 (3H, s, H-26), 1.51 (1H, m, H-10_(β)a), 1.40 (1H, m, H-9_(β)), 1.33 (1H, m, H-10_(β)b), 1.31 (3H, s, H-23), 1.27 (1H, M H-10_(α)a), 1.23 (1H, m, H-9_(α)a), 1.16 (3H, d, J=7.0 Hz, H-24), 1.10 (1H, m, H-9_(α)b), 1.07 (3 H, s, H-22), 0.95 (3H, d, J=7.0 Hz, H-25_(α)), 0.92 (3H, d, J=6.5 Hz, H-25_(β)), 0.75 (1H, m, H-10_(α)b); EIMS m/z 533 M⁺ XXX; HREIMS m/z 533.XXX (calcd. for C₃₀H₄₇NO₅S, 533.XXX).

Epothilone I₄ (33): colorless amorphous solid; [α]²² _(D) −XXX (c XXX, MeOH); UV (MeOH) λ_(max) nm (ε) XXX; IR (KBr) ν_(max)XXX cm⁻¹; ¹H NMR (CDCl₃, 400 MHz) δ 6.95 (1H, s, H-19), 6.53 (1H, bs, H-17), 5.47 (1H, dt, J=11.1, 5.8 Hz, H-12), 5.33 (1H, ddd, J=9.2, 3.9, 0.5 Hz, H-15), 5.33 (1H, m, H-13), 4.09 (1H, dddd, J=9.6, 8.1, 4.5, 3.3 Hz, H-3), 3.83 (1H, m, H-7), 3.57 (1H, bs, 3-OH), 2.89 (1H, dq, J=7.4, 7.1 Hz, H-6), 2.83 (1H, dq, J=8.1, 7.1 Hz, H-4),2.70 (3H, s, H-21),2.64 (1H, m, H-14a), 2.42 (1H, dd, J=14.2, 3.3 Hz, H-2a), 2.43 (1H, dd, J=14.2, 9.6 Hz, H-2b), 2.30 (1H, m, H-14b), 2.10 (3H, d, J=1.3 Hz, H-27),2.09 (2H, m, H-11), 1.81 (1H, m, H-8),1.74 (1H, bd, J=5.6 Hz, 7-OH), 1.53 (1H, m, H-10_(β)a), 1.49 (1H, m, H-9_(β)), 1.47 (1H, m, H-10_(α)a), 1.27 (1H, m, H-10_(β)b), 1.24 (1, m, H-9_(α)a) 1.17 (3H, d, J=7.1 Hz, H-23),1.14 (1H, m, H-9_(α)b) 1.08 (3H, d, J=7.1 Hz, H-24), 0.97 (3H, d, J=6.9 Hz, H-25_(α)), 0.91 (3H, d, J=6.5 Hz, H-25_(β)), 0.79 (1H, m, H-10_(α)b); ¹³C NMR (CDCl₃, 100 MHz) δ 217.0 (s, C-5), 170.8 (s, C-1), 164.8 (s, C-20), 152.4 (s, C-18), 137.1 (s, C-16), 134.6 (d, C-12), 124.7 (d, C-13), 120.2 (d, C-17),116.4 (d, C-19),78.7 (d, C-15), 76.4 (d, C-7),71.3 (d, C-3), 50.7 (d, C4), 50.1 (d, C-6), 40.7 (t, C-2), 38.5 (t, C-9_(α)), 35.5 (t, C-10_(α)), 33.4 (d, C-8), 31.8 (t, C-14), 30.0 (d, C-9_(β)), 27.2 (t, C-11), 26.7 (t, C-10_(β)), 21.4 (q, C-25_(β)), 19.3 (q, C-21), 18.2 (q, C-25_(α)), 15.4 (q, C-27),14.4 (q, C-24), 13.1 (q, C-23); EIMS m/z 505 [M]⁺ XXX; HREIMS m/z 505.XXX (calcd. for C₂₈H₄₃NO₅S, 505.XX.X).

Epothilone I₅, (34): colorless amorphous solid; [α]²² _(D) −XXX (c XXX, MeOH); UV (MeOH)) λ_(max) nm (ε) XXX; IR (KBr) ν_(max)XXX cm⁻¹; ¹H NMR (CDCl₃, 400 MHz) δ 6.97 (1H, s, H-19), 6.52 (1H, bs, H-17), 5.32 (1H, dd, J=7.1, 6.2 Hz, H-15), 5.03 (1H, dd, J=8.4, 5.0 Hz, H-13), 4.05 (1H, dddd, J=7.5, 7.2, 5.9, 4.6 Hz, H-3), 3.91 (1H, m, H-7), 3.17 (1H, d, J5.9 Hz, 3-OH), 2.94 (1H, d q, J=7.2, 7.1 Hz, H4), 2.87 (1H, dq, J=6.5, 6.9 Hz, H-6), 2.70 (3H, s, H-21), 2.62 (1H, dd, J=14.6, 4.6 Hz, H-2a), 2.60 (1H, M, H-14a), 2.53 (1H, dd, J=14.6, 7.5 Hz, H-2b), 2.31 (1H, m, H-14b), 2.10 (3H, d, J=1.1 Hz, H-27), 2.10 (1H, M, H-11a), 2.02 (1H, m, H-IIb), 1.97 (1H, bd, 1=5.6 Hz, 7-OH), 1.84 (1H, m, H-8), 1.66 (3H, s, H-26), 1.55 (1H, m, H-9_(β)) 1.49 (1H, m, H-10_(β)a), 1.39 (1H, m, H-10_(β)b), 1.33. (1H, m, H-10_(α)a), 1.31 (1H, m, H-9_(α)), 1.15 (3H, d, J=7.1 Hz, H-23), 1.12 (1H, m, H-9_(α)b), 1.11 (3H d, J=6.9 Hz, H-24), 0.97 (3H, d, J=6.9 Hz, H-25_(α)), 0.94 (1H, m, H-10_(α)b), 0.93 (3H, d, J=6.6 Hz, H-25_(β)); EIMS m/z 519 [M]⁺ XXX; HREIMS ink 519.XXX (calcd. for C₂₉H₄₅NO₅S, 519.XXX.

Epothilone I₆ (35): colorless, amorphous solid; [α]²² _(D) −XXX (c XXX, MeOH); UV (MeOH) λ_(max) nm (ε) XXX; IR (KBr) ν_(max)XXX cm⁻¹; ¹H NMR (CDCl₃, 400 MHz) δ 6.97 (1H, s, H-19),6.52 (1H, bs, H-17),5.24 (1H, dd, J=6.9, 6.9 Hz, H-15),5.02 (1H, dd, J=8.8, 5.2 Hz, H-13),4.22 (1H, tdd, J=6.1, 5.6, 4.8 Hz, H-3),3.76 (1H, ddd, J=6.1, 5.7, 5.6 Hz, H-7), 3.13 (1H, d, J=5.6 Hz, 3-OH), 3.05 (1H, dq, J=4.8, 7.0 Hz, H-4), 2.79 (1H, dq, J=5.6, 6.9 Hz, H-6),2.70 (3H, s, H-21), 2.62 (1H, m, H-14a), 2.57 (2H, d, J=6.1 Hz, H-2a), 2.30 (1H, m, H-14b), 2.08 (3H, d, J=1.0 Hz, H-27), 2.02 (2H, m, H-11), 1.73 (1H, d, J=6.1 Hz, 7-OH), 1.69 (1H, m, H-8), 1.66 (3H, s, H-26), XXX (H-9_(α), H-9_(β), H-10_(α), H-10_(β)), 1.21 (3H, d, J=7.0. Hz, H-22), 1.16 (3H, d, J=6.9 Hz, H-24), 0.94 (3H, d, J=6.9 Hz, H-25_(α)), 0.91 (3H, d, J=6.4 Hz, H-25_(β)); EIMS m/z 519 [M]⁺ XXX; HREIMS m/z 519.XXX (calcd. for C₂₉H₄₅NO₅S, 519.XXX).

Epothilone K (36): colorless amorphous solid; [α]²² _(D) −7 (c 0.08, MeOH); UV (MeOH) λ_(max) nm (ε) 212 (16700), 248 (12500); IR (KBr) ν_(max)3431, 2963, 2927, 2856, 1731, 1712, 1262, 1093, 1021, 802 cm⁻¹; ¹H NMR (CDCl₃, 300 MHz) δ 6.95 (1H, s, H-19), 6.51 (1H, bs, H-17), 5.49 (31H, m, H-15, H-13, and H-12), 4.04 (1H, dddd, J=7.9, 7.6, 6.9, 3.3 Hz, H-3), 3.36 (1H, dq, J=6.9, 6.8 Hz, H-6), 2.83 (1H, d, J=7.6 Hz, 3-OH), 2.75 (1H, ddd, J=16.1, 6.6, 3.4 Hz, H-14a), 2.74 (1H, dd, J=15.3, 3.3 Hz, H-2a), 2.71 (3H, s, H-21), 2.58 (2H, m, H-14b and H-8), 2.50 (1H, dd, J=15.3, 7.9 Hz, H-2b), 2.29 (1H, m, H-11a), 2.10 (1H, m, H-11b), 2.09 (311, d, J=0.7 Hz, H-27), 1.78 (1H,-m, H-9a), 1.65 (1H, m, H-10a), 1.48 (1H, m, H-10b), 1.18 (1H, m, H-9b), 1.15 (3H, d, J=6.8 Hz, H-22), 1.03 (3H, d, J=6.5 Hz, H-25); EIMS m/z 405 [M]⁺ (38), 317 (12), 260 (9), 232 (10), 204 (14), 190 (16), 168 (100), 164 (30), 151 (28); HREIMS m/z 405.″X (calcd. for C₂₆H₃₉NO₅S, 405.XXX).

(37): colorless amorphous solid; [α]²² _(D) −27.5 (c 0.4, MeOH); UV (MeOH) λ_(max) nm (ε) 211 (16100), 247 (12100); IR (KBr) ν_(max)3431, 2967, 2929, 2875, 1704, 1462, 1381, 1010 cm⁻¹; ¹H NMR (CDCl₃, 400 MHz) δ 6.94 (1H, s, H-19), 6.55 (1H, bs, H-17),5.56 (1H, dtt, J=10.8, 7.3, 1.4 Hz, H-12),5.39 (1H, dtt, J=10.8, 7.3, 1.4 Hz, H-13), 4.17 (1H, t, J=6.6 Hz, H-15), 3.50 (1H, ddd, J=8.7, 2.6, 2.6 Hz, H-7), 3.10 (1H, d, J=2.6, 7-OH), 2.90 (1H, dq, J=2.6, 7.2 Hz, H-6), 2.77 (1H, sep, J=6.9 Hz, H-4), 2.70 (3H, s, H-21), 2.40 (2H, m, H-14), 2.07 (2H, m, H-11), 2.04 (3H, d, J=1.1 Hz, H-27),1.78 (1H, bs, 15-OH), 1.74 (1H, m, H-9a), 1.50 (1H, m, H-8), 1.46 (1H, m, H-10a), 1.27 (1H, m, H-10b), 1.11 (1H, m, H-9b), 1.094 (3H, d, J=6.9 Hz, H-23), 1.089 (3H, d, J=6.9 Hz, H-22), 1.08 (3H, d, J=7.2 Hz, H-24), 0.82 (3H, d, J=6.7 Hz, H-25); ¹³C NMR (CDCl₃, 100 MHz) δ 220.5 (s, C-5), 164.6 (s, C-20), 152.9 (s, C-18), 141.5 (s, C-16), 133.4 (d, C-12), 125.0 (d, C-13), 119.2 (d, C-17), 115.6 (d, C-19), 77.2 (d, C-15), 74.9 (d, C-7), 44.9 (d, C-6), 40.0 (d, C-4), 35.5 (d, C-8), 33.5 (t, C-14), 32.3 (t, C-9), 27.9 (t, C-11), 26.9 (t, C-10), 19.2 (q, C-21), 18.6 (q, C-23), 18.1 (q, C-22), 15.6 (q, C-25), 14.4 (q, C-27), 9–3 (q, C-24); EIMS m/z 407 [M]⁺ (0.1), 204 (0.8), 168 (100), 140 (3.4); HREIMS m/z 407.XXX (calcd. for C₂₃H₃₇NO₃S, 407.XXX).

(38): colorless amorphous solid; [α]²² _(D) +25.0 (c 0.5, MeOH); UV (MeOH) λ_(max) nm (ε) 212 (17700), 247 (13400); IR (KBr) ν_(max)3427, 2971, 2933, 2878, 2858, 1709, 1457, 1377, 1186, 1023 cm⁻¹; ¹H NMR (CDCl₃, 300 MHz) δ 6.95 (1H, s, H-19), 6.55 (1H, bs, H-17), 5.52 (1H, dtt, J=10.9, 7.2, 1.4 Hz, H-12), 5.39 (1H, dtt, J=10.9, 7.1, 1.2 Hz, H-13), 4.18 (1H, ddt, J=3.4, 0.4, 6.7 Hz, H-15), 2.71 (3H, s, H-21), 2.51 (1H, bq, J=6.8 Hz, H-8), 2.48 (1H, dq, J=17.7, 7.4 Hz, H-6a), 2.41 (1H, dq, 1=17.7, 7.2 Hz, H-6b), 2.39 (2H, ddd, J=7.1, 6.7, 1.4 Hz, H-14), 2.06 (2H, ddt, 7.2, 1.2, 7.0 Hz, H-11), 2.05 (3H, d, J=1.4 Hz, H-27), 1.81 (1H, d, J=3.4 Hz, 15-01-1), 1.66 (1H, m, H-9a), 1.32 (1H, m, H-9b), 1.31 (2H, m, H-10), 1.06 (3K d, J=6J Hz, H-25), 1.04 (3H, dd, J=7.4, 7.2 Hz, H-24); ¹³C NMR (CDCl₃, 75 MHz) δ 215.3 (s, C-7), 164.6 (s, C-20),152.9 (s, C-18),141.5 (s, C-16),132.7 (d, C-12),125.3 (d, C-13),119.2 (d, C-17), 115.6 (d, C-19),77.2 (d, C-15),46.0 (d, C-8),34.3 (t, C-14), 33.5 (t, C-6), 32.7 (t, C-9),27.5 (t, C-11), 27.3 (t, C-10), 19.2 (q, C-21),16.5 (q, C-25),14.4 (q, C-27), 7.8 (q, C-24); EIMS m/z 335 [M]⁺ (2),317 (4),170 (27), 169 (67), 168 (100), 140 (20); HREIMS m1z 335.1912 (calcd. for C₁₉H₂₉NO₂S, 335.1919).

(39): colorless amorphous solid; [α]²² _(D) +26.4 (c 0.27, MeOH); UV (MeOH) λ_(max) nm (ε) 203 (19100), 244 (12500); IR (KBr) ν_(max)3430, 2970, 2934, 2877, 1710, 1458, 1377, 1184 cm⁻¹; ¹H NMR (CDCl₃, 400 MHz) δ 6.94 (1H, s, H-19),6.55 (1H, bs, H-17), 5.17 (1H, t, J=7.3 Hz, H-13), 4.13 (1H, m, H-15), 2.70 (3H, s, H-21), 2.51 (1H, bq, J=6.8 Hz, H-8), 2.47 (1H, dq, J=17.7, 7.2 Hz, H-6a), 2.41 (1H, dq, J=17.7, 7.2 Hz, H-6b), 2.33 (2H, bdd, J=7.3, 6.8 Hz, H-14),2.05 (3H, d, J=1.2 Hz, H-27),2.03 (2H, m, H-11), 1.71 (1H, d, J=3.2 Hz, 15-OH), 1.69 (3H, d, J=1.3 Hz, H-26),1.62 (1H, m, H-9a), 1.32 (3H, m, H-10 and H-9b), 1.06 (3H, d, J=6.9 Hz, H-25), 1.03 (3H, t, J=7.2 Hz, H-24); EIMS m/z 349 [M]⁺ (0.7), 331 (1.7), 168 (100), 140 (5.1); HREIMS m/., 349.XXX (calcd. for C₂₀H₃₁NO₂S, 349.XXX).

TABLE 1 Activity of epothilones and compounds (1) to (39) against mouse fibroblasts (L929, IC 50/ng/ml) Epothilone Structural type Aγ Bγ Cγ Dγ trans Cγ Starting epothilone (1) 4 (2) 1–2 (14) 50–100 (15) 20 — 21-Hydroxy (E & F) (3) 10 (4) 1.5 — — — Oxozoles (G & H) (10) 6 (11) 1 (12) 120 (13) 11 — (R)-4-Desmethyl (X₁) (5) 20 — (16) 200 (17) 20 (28) 400 (S)-4-Desmethyl (X₂) (6) 7 — (10) 25–30 (19) 12 (29) 80 6-Desmethyl (X₃) — — (20 1500 — — 8-Desmethyl (X₄) — — (21) 800 — — 8,9-Dehydro (X₅) — — (22) 1500 (23) 200 10,11-Dehydro (X₆) — — (24) 120 — — 14-Hydroxy (X₇) — — (25) — — 16-Desmethyl (X₈) (7) 20 — (26) 250 27-Hydroxy (X₉) (8) 100 — (27) 200 — — 21-Methyl (X₁₀) — (9) 1.5 — — Compound — — (36) 180 Compound — — (37) 50 — — Compound — — (38) 2000 (39) 500 — 

1. An epothilone of the formula:

wherein: for Epothilone C₅ (22) R═H or Epothilone D₅ (23) R=methyl; said epothilone having a state of purity such as to be substantially free of Epothilone A and Epothilone B.
 2. The epothilone according to claim 1, wherein said epothilone is substantially free of other major metabolic products produced by DSM6773.
 3. An epothilone of the formula:

Epothilone C₆ (24); said epothilone having a state of purity such as to be substantially free of Epothilone A and Epothilone B.
 4. The epothilone according to claim 3, wherein said epothilone is substantially free of other major metabolic products produced by DSM6773.
 5. An epothilone of the formula:

wherein: for Epothilone C₇ (25) R⁷═OH; R⁸=methyl or Epothilone C₉ (27) R═CH₂OH; R⁷═H; said epothilone having a state of purity such as to be substantially free of Epothilone A and Epothilone B.
 6. The epothilone according to claim 5, wherein said epothilone is substantially free of other major metabolic products produced by DSM6773.
 7. The epothilone according to claim 1, wherein said epothilone is substantially free of Epothilone D.
 8. The epothilone according to claim 3, wherein said epothilone is substantially free of Epothilone D.
 9. The epothilone according to claim 5, wherein said epothilone is substantially free of Epothilone D.
 10. The epothilone according to claim 1, wherein said epothilone is substantially free of Epothilone C.
 11. The epothilone according to claim 3, wherein said epothilone is substantially free of Epothilone C.
 12. The epothilone according to claim 5, wherein said epothilone is substantially free of Epothilone C. 